Right now
The most recent data we hold from NOAA arrived 4 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 16 May 2026 at 06:05 UTC. It is kept here as a record.
It is the 5th strongest of the 102 detections recorded within 20 km of this point since 14 April 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 16 at 12:55AM CDT until May 16 at 1:00AM CDT by NWS Milwaukee/Sullivan WI
An estimated 359,645 people live within 50 km of this point.
Nearby, since 14 April 2026
- May 16, 2026 · score 43 · 6.9 km
- June 18, 2026 · score 43 · 8.0 km
- July 2, 2026 · score 67 · 18.8 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 90 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 43 / 100 |
| Our confidence | 90% |
| Coordinates | 42.9717, -89.7347 |
| Nearest City | Fitchburg (22 km) |
| Population Exposed | 359.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-16T05:55:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.7875c5f61492f76e93fa14811f2b8aee |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Iowa, WI; Lafayette, WI; Dane, WI; Green, WI; Rock, WI |
| Headline | Severe Thunderstorm Warning issued May 16 at 12:55AM CDT until May 16 at 1:00AM CDT by NWS Milwaukee/Sullivan WI |
| Expires | 2026-05-16T01:05:00-05:00 |
| SenderName | NWS Milwaukee/Sullivan WI |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7875c5f61492f76e93fa14811f2b8aee31f30f35.001.1","noaa_urn:oid:2.49.0.1.840.0.7710d31eadb682a6402ff99df4a96ffaad496e8d.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 61 |
| Iem Unit | MPH |
| Iem City | 5 SSW Livingston |
| Iem County | Grant |
| Iem State | WI |
| Iem Wfo | ARX |
| MergedSources | [{"id":"iem_G_42.840_-90.480_1778907000000","source":"iem","severity":"low","severityValue":25,"timestamp":1778907000000,"latitude":42.84,"longitude":-90.48},{"id":"iem_G_42.840_-90.480_1778907180000","source":"iem","severity":"low","severityValue":25,"timestamp":1778907180000,"latitude":42.84,"longitude":-90.48}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens near Fitchburg?
Calamity.live data shows a weather event with CalamityScore 43/100, near Fitchburg (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.